Dust extractor

Abstract

A suction cup dust extractor for a drill having a housing; a drill collar attached to the housing, having a drill passage formed through it; an aperture located on the housing through which air can be sucked out by a suction device; a recess formed by the walls of the housing having an opening which, in use, locates against a work piece to create a chamber; at least one first air passage formed within the housing which enables air to pass from the drill passage to the aperture; at least one second air passage formed within the housing which enables air to pass from the recess to the aperture; and a manually operable valve mechanism mounted in the housing which is connected to the recess and which, when operated, allows air surrounding the housing to freely enter the recess when its opening is located against a work piece; characterized in that the housing further comprises a hand grip), the valve mechanism being mounted, at least in part, inside of the hand grip.

The invention claimed is: 
     
       1. A suction cup dust extractor for a drill comprising:
 a housing; 
 a drill collar attached to the housing, having a drill passage formed through it; 
 an aperture located on the housing through which air can be sucked out by a suction device; 
 a recess formed by walls of the housing having an opening which, in use, locates against a work piece to create a chamber; 
 at least one first air passage formed within the housing which enables air to pass from the drill passage to the aperture; 
 at least one second air passage formed within the housing which enables air to pass from the recess to the aperture; and 
 a manually operable valve mechanism mounted in the housing which is connected to the recess and which, when operated, allows air surrounding the housing to freely enter the recess when the opening is located against a work piece; 
 characterized in that the housing further comprises a hand grip, the valve mechanism being mounted, at least in part, inside of the hand grip, wherein the valve mechanism comprises two moveable buttons, one of which is mounted on one side of the hand grip, the other being mounted on the other and opposite side of the hand grip, each button being moveable between a first position where it operates the valve mechanism and a second position where it does not operate the valve mechanism, each button being biased to its second position. 
 
     
     
       2. The suction cup dust extractor of  claim 1 , wherein each button is mounted on an end of a curved resiliently deformable frame mounted inside the hand grip. 
     
     
       3. The suction cup dust extractor of  claim 2 , wherein the deformable frame comprises a plastic support and a leaf spring. 
     
     
       4. The suction cup dust extractor of  claim 3 , wherein the leaf spring biases the buttons to their second positions. 
     
     
       5. The suction cup dust extractor of  claim 1 , further including an intermediary chamber in the hand grip which is connected to the recess so that air can freely move between the two; and
 wherein, when each button is in its first position, it locates inside of the intermediate chamber and when each button is in its second position, it locates with an aperture formed in the wall of the chamber. 
 
     
     
       6. The suction cup dust extractor of  claim 5 , wherein when the buttons are in their second positions, ends of the deformable frame or the buttons engage with edges of the aperture to form an air tight seal. 
     
     
       7. The suction cup dust extractor of  claim 1 , wherein the buttons are located on the hand grip so that movement of either button from its second position to its first position moves it towards the other button. 
     
     
       8. The suction cup dust extractor of  claim 1 , wherein the at least one first air passage is at least partially located in the hand grip. 
     
     
       9. The suction cup dust extractor of  claim 1 , wherein the aperture is located on the hand grip. 
     
     
       10. The suction cup dust extractor of  claim 1 , further including a hole in the walls of the recess to allow a limited flow of air into the recess. 
     
     
       11. The suction cup dust extractor of  claim 1 , wherein the at least one first passage connects between the aperture and the drill passage. 
     
     
       12. The suction cup dust extractor of  claim 1 , wherein the at least one second passage intersects with the at least one first passage inside of the housing. 
     
     
       13. The suction cup dust extractor of  claim 1 , wherein the at least one first passage comprises a throat, the at least one second passage intersecting with the at least one first passage at the throat. 
     
     
       14. The suction cup dust extractor of  claim 1 , further including a connection collar which is connected to the aperture via a flexible tube.